Telegraph system with protection against errors and correction of same



Oct. 27, 1964 J. VAN DALEN C. TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME 19 Sheets-Sheet 1 Filed June 7. 1961 a a .s s"! 2! 11 N g 2 E 3 I 5-A 11StSt1tt &111111mu1nx z a a A c c a 5 B d d A 5 e c u 7 f f J r 9 h h E 10 E I g l a 11 F Hi I Fl 6. 1 a INVENTOR:

EHHISTIAAN J. Eur BALM.

Oct. 27, 1964 Q VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June 7. 1961 19 Sheets-Sheet 2 8-8 g E I, g g 5" a A a a A d n 1 u 5 I c c 1 c 7 v f F d a 1 B E 6 A e g L g I 6 g 11 2 b INVENTOR: H61 [71112151112121 J. I/hNDALBN.

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Oct. 27, 1964 Filed June '7, 1961 $8 I I Q g 2 N N 211St$t1t t n1 n: ill!!! I j 2 a a I z 3 z b b A A A c c I 5 d a x 5 e c I u 7 f f c 8 c g e j F s u h l h I E n F H F G. 2 a INVENTOR:

c. J. VA N DALEN TELEGRAPH SYST EM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME 19 Sheets-Sheet 3 [H1215 TIAAN J. Mm DALEN.

Oct. 27, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June 7, 1961 19 Sheets-Sheet 4 S '31 8'8 g g so 111 x115!!! [11 t t St22St1z z z z A A a B B b c t E c 7 r F d a e s s X e g h t 10 n n g 9 11 a 5 l \L Y b H 2 INVENTOR:

EHHIs mm J. VAN DALEN.

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Oct. 27, 1964 (1.1;). TELEGRAPH SYS EM VAN DALEN WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June '7, 1961 a d d 19 Sheets-Sheet 5 c '5 vrs SIJ' v 2'. 1 N R z11StSt1t t 11: 11 w n1 111 i z a z b I b A C A 5 B d d B t a 7 r d A n 1" a c g e n =2 9 n h f 10 E g E nzsr F 11 F h a n G i l n n 1: I I

Fl 6. 3 a INVENTOR.

EHHIETJAAN J. IZANDALEN.

Oct. 27, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June 7, 1961 19 Sheets-Sheet 6 a a :2. 8'8 '5 E 75 8 g z su 11115 111111 ttstzzst'lz a n s c c E c 7 n r a a E I a e g i F I 1 1o REST g 6 '9 11 h N H h 12 i I I 1 1a i l 1 1b 15 H 3 b INVENTOR:

EHRIEI'TIAAN J. IZANJJALEN.

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Oct. 27, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June 7. 1961 19 Sheets-Sheet 7 :L d F 9- s. 5" v v 1' g g 2 3 T 211St5t1tt' III III w n1 n1 z 2 z b b A 3 A c c m a d d A 5 e c c j 9 E g e h h E 1: 11 E I i g I u 12 F a I g n G I k 1 1n n t I F I [5. L INVENTOR:

CHRIS TIAAN J. Vim DALE'N.

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27, 1964 c. J. VAN DALEN 3, 5 ,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF" SAME Filed June 7, 1961 19 sheets sheet 8 :2. -.e. e a r: 2 v. s s

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EHmsmAN J. I/IqNDALEN.

@ct, 2?, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORs AND CORRECTION OF SAME Filed June '7, 1961 19 Sheets-Sheet 9 E i ,4 E S-A 50' z 1' g 3 1: N N z 11Stflt t n1 111 m III 111 8% 7 f d E [3 1w 6 c g 9 l a s d E s m g u 11 u h f s 12 E I i I I r P n F l h 1 n g 15 n I I :|[5 '5 a INVENTOR:

FHA Is TIAAN l I/I INZMLLN.

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Get. 27, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June 7, 1961 19 Sheets-Sheet 1o ,9 5.8 g g E g g 1 2 su L lfi III w III III ttSiz2St12 z z 2 al a A a 3 gb B a b 1. %X A c 5 %x S a a F g c E v-- rc 7 %K A, I a a 5%? E g d L n F d 10 F H F I I I q 12 FlG.5

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0d. 1964 c. J. VAN DALEN TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME l9 Sheets-Sheet 11 Filed June '7, 1961 IN VEN TOR. EHEJETIAAN J. VAN DALEN ATTZ Oct. 27, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June '7. 1961 19 Sheets-Sheet 12 l l1 unoU x 3 9. JT w INVENTOR: CHRIS TIAAN J YANDALEN BY 4/ ATTY.

C. J. VAN DALEN TELEGRAPH SYSTEM WITH PROTECTION AGAINST Oct. 27, 1964 ERRORS AND CORRECTION OF SAME l9 Sheets-Sheet 13 Filed June '7, 1961 IN VEN TOR: EHHIBTIAAN J. VAN .UALBN.

Oct. 27, 1964 c. J. VAN DALEN 3,154,638

TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME Filed June 7. 1961 19 Sheets-Sheet 14 QQE INVEN TOR. 511.1215 TJAAN J. Vim DALEN.

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Oct. 27, 1964 c. J. VAN DALEN TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME l9 Sheets-Sheet 15 Filed June '7, 1961 IO P @a 318 :m: T m a n IQWI|IM m N 1% 3.5.5: J fi Cm ulllw/lluurrllllhn. 11L N wzrawwww IN VEN TOR. EHEIS TJAAN i MANDALEN.

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1964 c. J. VAN DALEN TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME l9 Sheets-Sheet 16 Filed June '7, 1961 a 4 mm ma s-Q INVENTOR: EHRIBTIAAN J. T/lm DALEN.

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Oct. 27, 1964 c. J. VAN DALEN TELEGRAPH SYSTEM WITH PROTECTION AGAINST ERRORS AND CORRECTION OF SAME l9 Sheets-Sheet 17 Filed June '7, 1961 INVENTOR: CHRIETIAAN J. Vim DALEN ATTY C. J. VAN DALEN TELEGRAPH SYSTEM WITH PROTECTION AGAINST Oct. 27, 1964 l9 Sheets-Sheet 18 Filed June 7, 1961 0; uuwwzra w m 3205: m m

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INVENTOR: EHRISTJAAN J. I/IIN DALBN Oct. 27, 1 c. J. VAN DALEN TELEGRAPH SYS 19 Sheets-Sheet 19 Filed June 7, 1961 i mmii INVENTOR. EHEIETIAAN J. VAN FALEN.

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United States Patent Ofifice 3,l i,63 Patented Get. 27, 1964 3,154,638 TELEGRAPH SYSTEM WITH PRQTECTTQN QGAINST ERRURS AND CQRRECTEGN Uh" AME Christiaan Johannes van Dalen, Leidschendam, Netherlands, assignor to De Staat der Nederlanden, ten deze vertegenwocrdigd door de Directeur Generaal der Posterijen, Telegrafie en Telefonie, The Hague, Netherlands Filed Tune '7, 1961, Ser. No. 115,38il Claims priority, application Netherlands, June 9, 1960, 252,436 19 Claims. (till. 178-23) The invention relates to a type printing telegraph syscom for traffic in two directions, provided with means for correcting mutilated signals by repetition.

In existing printing telegraph systems, especially radio systems, a so-called repetition cycle is initiated on arrival of a mutilated signal, during which repetition cycle the printer is blocked. Usually the duration of this repetition cycle is equal to the duration of four signals. Immediately on detection of a mutilated signal a request for repetition is sent to the distant station. However, before this request for repetition has reached the distant station, this distant station has transmitted some more signals, which may have arrived correctly, but are not printed as the printer is blocked. Furthermore one of the four signals in the repetition cycle (as seen by the receiving end) is a special signal, such as I, but it does not belong to the text to be transmitted. It was the object of the invention described in the copending Van Dalen US. Patent No. 3,001,018 issued Sept. 19, 1961 to avoid both the loss of correctly received signals, and to recover the place lost by transmission of a special signal.

Both of these objects were achieved in said copending patent by providing two channels for alternate signals for traific in each of the two directions, whereby the signals correctly received between the incorrect reception of a signal and the correct reception obtained by repetition of this signal, are stored in a memory provided with switching means capable of supplying these stored signals as well as the signals obtained by repetition, in the right sequence to the printer. Thus the repetition of a signal received mutilated in one channel is requested by the repeated transmission of the last signal transmitted via that channel. However, the difference between the procedure, after the reception of a mutilated (disturbed) signal and after the reception of a request for repetition was that the signal received after the reception of the disturbed signal was directed to and temporarily stored in a memory, and the signal received after the reception of a request for repetition was directed to the printer immediately. This latter gives rise to the following problem: If a request for repetition is received incorrectly (although it does not happen very often that after a faulty reception of a trafiic signal at one end of the connection, the request for repetition at the other end also will be received faulty, still it can happen) then the signal received thereafter will be directed to the memory when it should have been directed to the printer, and so the correct sequence of the printing is disturbed.

The object of the present invention is to avoid this loss of correct printing sequence in such a case, and accordingly this invention relates to an improvement on the system described in the US. patent application Serial No. 733,925, now US. Patent No. 3,001,018 issued September 19, 1961.

It has appeared that in the two directions of transmission together an increased average amount of trailic can be handled in the case of a quite symmetrical construction of the installations.

Thus the influence of repetitions on the intensity of tratfic is only given by the number of the channel in which they occur, and no longer by their occurrence in go or return path.

This invention accordingly provides an improvement of the two-Way system according to the above mentioned copending patent in which correction of mutilated signals is obtained by repetition, and which is characterized in that the signals correctly received between the incorrect reception of a signal and the correct reception of this signal obtained by repetition are stored in a memory provided with switching means capable of supplying these stored signals, as well as the signals obtained by repetition, to the printer in the right sequence. The improvement consists in that the go and return paths in these separate channels are combined into a single homogeneously working multi-channel system.

The invention particularly relates to a system of this kind, in which use is made of at least two separate channels for the transmission of messages coming from one subscriber. To achieve this, both stations are pro vided with a double transmitting memory and a double receiving memory. Accordingly the transmission of alternate traific signals are tied to a definite channel, such as for example, the odd signals are transmitted in channel I and the even signals are transmitted in channel II, that is, if the folowing tramc signals must be transmitted: A, B, C, D and so on, then the letter A is transmitted via channel I, the letter B is transmitted via channel 11, the letter C is transmitted via channel I, the letter D is transmitted via channel II, and so on. This channel-tied transmission is retained also after faulty reception. If, after faulty reception, there is a request for repetition, for example, with a signal from channel I, and the next to be transmitted signal belongs to channel I, then the next following signal belonging to channel II is transmitted first and the signal belonging to channel I is temporarily stored in a memory in the transmitter so that the transmitter is thus (according to this invention) equipped with an extra memory.

The above mentioned and other features and objects of this invention and the manner of attaining them will become more apparent and the invention itself will be understood best by reference to the following description of an embodiment of this invention taken in conjunction with the accompanying drawings, wherein:

FIG. 1a and FIG. 1b comprise a time diagram of a two channel communication system according to this invention for an undisturbed response to the mutilation of the letter c;

FIGS. 2a and 2b comprise a time diagram similar to FIGS. 1a and 15 for a disturbed response to the mutilation of the letter 0;

FIGS. 3:: and 3b comprise a time diagram similar to FIGS. 1a and lb for a disturbed response in both channels to mutilation of the letters c and d;

FIGS. 4a and 4b comprise time diagrams similar to FIGS. 1:: and 1b for a disturbed response to the mutilation of the letter 0 twice in succession in the same channel;

FIGS. 5a and 51) comprise a time diagram similar to FIGS. 1a and 1b for a disturbed response in both channels of the letters 0 and d and also to the repetition of the letter 0; and

FIGS. 6-2 through 6-10 show similar schematic block wiring diagrams of parts of a circuit at two stations according to the moments 2 through 10 as illustrated in the time diagram of FIGS. 1a and 1b. in

FIGS. 1a and 1b illustrates a case in which station A transmits an alphabet of small letters, station B transmitting an alphabet of capital letters, both in a twochannel system, for example, to begin with A and a, resp, in channel I, then B and b, resp., in channel II, etc. 

19. A SYSTEM FOR COMMUNICATING A PLURALITY OF SUCCESSIVE SIGNALS BETWEEN TWO STATIONS IN BOTH DIRECTIONS, EACH STATION COMPRISING: (A) A TRANSMITTER COMPRISING: (1) A SOURCE OF SIGNALS TO BE TRANSMITTED, (2) A FIRST PAIR OF TRANSMITTER STORING MEANS FOR ALTERNATELY STORING SAID SIGNALS TO BE TRANSMITTED, THE ODD NUMBERED SIGNALS IN THE SEQUENCE OF THE SIGNALS TO BE TRANSMITTED BEING STORED IN ONE STORING MEANS, AND THE EVEN NUMBERED SIGNALS BEING STORED IN THE OTHER STORING MEANS, (3) MEANS ALTERNATELY CONNECTING AT A CONSTANT RHYTHM SAID FIRST PAIR OF TRANSMITTER STORING MEANS TO SAID SOURCE, (4) A SECOND PAIR OF TRANMITTER STORING MEANS FOR STORING THE SIGNALS TO BE TRANSMITTED, RESPECTIVELY CONNECTED WITH SAID FIRST PAIR OF TRANSMITTER STORING MEANS, (5) MEANS TO TRANSFER SAID SIGNALS FROM SAID FIRST TRANSMITTER STORING MEANS TO SAID SECOND TRANSMITTER STORING MEANS, (6) MEANS CONNECTED TO SAID FIRST AND SECOND TRANSMITTER STORING MEANS TO CONTROL SAID TRANSFER MEANS, AND 